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Temporary fix of InstrM to prevent testbench hanging

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This commit is contained in:
David Harris 2023-11-03 04:59:44 -07:00
parent 09aebbf252
commit 402538e13c
1 changed files with 6 additions and 6 deletions
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12
src/ifu/ifu.sv
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@ -386,22 +386,22 @@ module ifu import cvw::*; #(parameter cvw_t P) (
assign BranchMisalignedFaultE = (IEUAdrE[1] & ~P.COMPRESSED_SUPPORTED) & PCSrcE;
flopenr #(1) InstrMisalignedReg(clk, reset, ~StallM, BranchMisalignedFaultE, InstrMisalignedFaultM);
// Instruction and PC pipeline registers
// Cannot use flopenrc for Instr(E/M) as it resets to NOP not 0.
// Instruction and PC pipeline registers flush to NOP, not zero
mux2 #(32) FlushInstrEMux(InstrD, nop, FlushE, NextInstrD);
mux2 #(32) FlushInstrMMux(InstrE, nop, FlushM, NextInstrE);
flopenr #(32) InstrEReg(clk, reset, ~StallE, NextInstrD, InstrE);
flopenr #(P.XLEN) PCEReg(clk, reset, ~StallE, PCD, PCE);
// InstrM is only needed with CSRs or atomic operations
if (P.ZICSR_SUPPORTED | P.A_SUPPORTED)
if (P.ZICSR_SUPPORTED | P.A_SUPPORTED | 1)
flopenr #(32) InstrMReg(clk, reset, ~StallM, NextInstrE, InstrM);
else assign InstrM = 0;
// PCM is only needed with CSRs or branch prediction
if (P.ZICSR_SUPPORTED | P.BPRED_SUPPORTED)
flopenr #(P.XLEN) PCMReg(clk, reset, ~StallM, PCE, PCM);
else assign PCM = 0;
// If compressed instructions are supported, increment PCLink by 2 or 4 for a jal. Otherwise, just by 4
if (P.COMPRESSED_SUPPORTED) begin
logic CompressedD; // instruction is compressed
flopenrc #(1) CompressedDReg(clk, reset, FlushD, ~StallD, CompressedF, CompressedD);
@ -411,9 +411,9 @@ module ifu import cvw::*; #(parameter cvw_t P) (
assign CompressedE = 0;
assign PCLinkE = PCE + 'd4;
end
// pipeline original compressed instruction in case it is needed for MTVAL on an illegal instruction exception
if (P.ZICSR_SUPPORTED & P.COMPRESSED_SUPPORTED) begin
if (P.ZICSR_SUPPORTED & P.COMPRESSED_SUPPORTED | 1) begin
logic CompressedM; // instruction is compressed
flopenrc #(16) InstrRawEReg(clk, reset, FlushE, ~StallE, InstrRawD[15:0], InstrRawE);
flopenrc #(16) InstrRawMReg(clk, reset, FlushM, ~StallM, InstrRawE, InstrRawM);